Windows \r\n line endings are not supported

The InputStream reads a single byte at a time, and it considers `\r` to be a regular token. 
When `Parser::detectSymbols()` encounters a `\r` token, it throws a "invalid character" exception.

The simplest fix would be to normalize line endings before to normalize whitespace before tokenizing, like
```php
$term = preg_replace('/\s+/', ' ', $term);
```